Manufacture of insoluble lime salts of fatty acids.



UNITED STATES PATENT OFFICE.

. HARVEY NJ'BARRETT, OF BAYBRIDGE, ]OHIO, ASSIGNOR TO MEDUSA CONCRETE WATER- 'PROOFI NG COMPANY, OF S ANDUSKY, OHIO, A CORPORATION OF OHIO.

, MANUFACTURE OF IKSOLUBLE LIME SALTS OF FATTY ACIDS.

Specification of-Letters Patent.

Patented Sept. 15, 1908.

Application filed August 14, 1907. Serial No; 388,522.

i To all whom it may concern:

Be it known that I, HARVEY N. BARRETT, a citizen of the United States, and resident of Baybridge, in the county of Erie and State of Ohio, have invented certain new and useful Improvements in the Manufacture of Insoluble Lime Salts of Fatty Acids, of which the following is a specification.

In Letters Patent No. 851 ,247 granted to Spencer B. Newberry, April 23, 1907, there is described a process of rendering cement waterproof by mixing therewith a small per-' centageof the insoluble lime salt of a fatty acid. In the specification of this patent are also described two methods of making the insoluble lime salt, or stearate of lime, as it is called.

The present invention relates to an. ,improved process of manufacturing stearate of ime suitable for rendering cement waterproof according. to the process of said patent.

I In practice it has hitherto been customary in preparing stearate of lime, orinsoluble lime salt, for waterproofing cement, to make use of free fatty acids obtained from animal or vegetable fats oroils by known methods and to convert these into the lime compound by heating with lime, with or without the presence of water. I have discovered a sim'' ple and practical method of making the desired lime salt of fatty acids,or stearate of lime, or generall speaking lime soap direct from fats or o' s, which method consists broadly inheatin the mixture of animal or vegetable oil or at and slaked or hydrate lime to a tem erature above the boiling point of water, an referably to about four hundred de recs IR, in a suitable vat or vessel. When t 's mixture is thus heated a strong reaction takes place, the fatty acids combine with the lime to form the desired lime salt and the glycerin and water set free are rapfatty matter and melt it in a vat, raising its temperature to, preferably, four hundred to four hundred and forty degrees F. I then add a quantity of slaked or hydrate lime equal to from twelve to twenty per cent. of the weight of the fat or oil. The mixture is then stirred thoroughly until the reaction has subsided and the expulsion of volatile matter practically ceased, which takes from a few-minutes to an hour, according to the quantity of material employed. The lime salt of the fatty acids remains in the vat in the form of a semi-fused mass which on cooling congeals to a brittle substance which may be rea ily ground to fine powder, which powder is adapted-for use in water roofing cement by the process described in't e Newberry patent. In place of slaked or hydrate lime, quicklime may be used, but slaked lime is (preferable, as the water contained therein a1 s in expelling the glycerin setfr'ee in the volatile at this temperature have been expelled.

2. The methodof making lime soap,which consists in mixing a quantity of fatty matter with from 12 to 20 per cent, byweight,

'of slaked or hydrate lime and heating the mixture to approximately 400 degrees F.

until the reaction has subsided and the water and glycerin present in the mass have been expelle n testimony whereof I afiix my signature in presence of two witnesses.

HARVEY N. BARRETT Witnesses:

SPENCER B. NEWBERRY H. A. DUNKEL. 

